- 
                  
Physical Science
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Half-life, Radioactivity, Nuclear energy, Radiation
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Edad 14-18
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level: 8th through 11th grade
 - 
                  
English
 
Author's Instructions
Half-life problems with quiz
- 
                  
Physical Science
 - 
                  
Half-life, Radioactivity, Nuclear energy, Radiation
 - 
                    
Edad 14-18
 - 
                    
level: 8th through 11th grade
 - 
                  
English
 
Author's Instructions
Half-life problems with quiz
